Source: reddit Reddit - Dive into anything
https://www.reddit.com/r/aoe2/comments/12166ik/all_balance_changes_i_noticed_in_april_pup/?utm_source=share&utm_medium=android_app&utm_name=androidcss&utm_term=1&utm_content=share_button

General
-NEW TECH Gambesons.Militia line gets +1 pierce armor
-Elite Steppe lancer base pierce armor is 2(previously 1)
-Pikeman upgrade cost now is 160f 90g (previously 215f 90g)
-Eagle line cost 25f 50g (previously 20f50g )
-Elite Elephant Archer upgrade cost 800w 500g (previously 1000f 800g )
-Heavy scorpion upgrade costs 800f900w (previously 1000f 1100w)
-Siege elephant upgrade costs 850f(previously 650f)
-Sappers grants villagers +3 damage against rams
Civ Specific
-Celts. Stronghold Castles now also heal infantry units around castles in 7 tiles
-Bengalis. New bonus Cavalry +2 damage against Skirmishers.
Mahayana monks now also takes 10% less pop space.
-Byzantines.Greek fire now also grants +5 blast damage to bombard towers
-Berber. Vills move only 5% faster in dark.Still 10% in feudal
-Bohemians. Hussite reforms cost reduced to 500f 450g(previously #### 450g)
-Britons. TB Archery ranges work 10% faster(previously 20%)
-Burgunidians. Flemish Revolution Now Flemish militia trains in barracks
Base cost now is 200f 150g +10f +5g for each villager(previously 1200f 650g)
Flemish militia is now costs 50f 15g(previously 60f 25g), 60hp, 11 attacks, 1/0 armor (previously 75hp 12 attack 1/1 armor)
-Burmese.Elite arambai upgrade cost 1000f 750g(previously 1100f 675g)
-Chinese. Now start wtih +2 vills but -150f and -50w(previously +3 vills but -200f and -50w)
-Dravidians Siege weapons costs 33% less wood
-Ethiopians. Royal Heirs rework. Now
Camel units and Shotel warriors gets -3 damage from mounted units.
TB outposts now also costs no stone
-Gurjaras. Shrivamsha riders now cost 70f30g(previously 70f 20g).Kshatriyas now cost 500f 450g(previously 200f 450g)
-Goths Hunts lasts 20% longer
-Huns. Atheism costs 500f300w(previously 500f 500g)
-Incas. Military units costs -15%(dark)-20%(feudal)-25%(castle)-30%(imp)less food.
New
TB Start with llama.(previously +2 LOS for skirms and pikes)
Andean Slings now also grants Slingers +1 attack.
Slinger base cost 40f40g(previously 30f 40g).Kamayuk Base cost 65f30g(previously 60f 30g)
-Japanese. Kataparuto costs 550w 300g(750w 400g)
-Lithunians. Now each town center provides 100f(previously +150f at start)
-Malay. New bonus Infantry armor upgrades free
-Malians. Villager now drop off 15% more gold(previously gold mines lasts 30% longer)
-Poles. Villages doesnt regenerate in dark age
-Sicilians. Castles builts 50% faster,TCs still 100%(lol).(previously 100% for each)
First crusade cost 400f300g and spawns only 5 serjeants per tc. (previously #### 600g and 7 serjeants per tc)
Donjons can train pike line now too.
Elite serjeant costs 800f675g(previously 1100f 875g)
-Slavs. Gambesons free.
Boyars cost 60f70g.(previously 50f80g)
Druzhina costs 900f500g(previously 1200f 500g)
-Spanish. New bonus Receive 20 gold for each researched tech.
(non elite)Conquistador base pierce armor 1(previously 2)
Inquisition now also granst +1 range to missionaires
-Turks. Artillery costs 600f650g(previously 450w 400g)
-Vietnamesse. Paper money cost 550F 200W(previously 600w 350g)
-Vikings. Chieftains Infantry now algo gets gold for killing vill(5g),trade units(20g) and monks(20g).
New Imperial UT Bogsweigar 650f 500g Archer line and Longboats gets +1 attack
-Portuguese. (elite)Organ gun base damage is 7(9) with 5(6) projectiles
A bit surprise Vikings get buff on archers.