Hard to compare because AoE1 tiles are smaller then AoE2 tiles.
So on paper the catapult outranged a castle. And every unit is 33% faster too.
Easily 2x the HP and a higher attack speed while also having lower costs overall.
Not really. For example AoE1 and AoE2 villagers have the same stats.
Clubman and Militia have similar stats.
But Legions are easily 2x as strong as Champions while being cheaper.
AoE1 units get a lot stronger though the ages compared to AoE2 while starting with similar numbers.
I talked about all of those things in my thread
AoE1DE should become an AoE2DE Expansion
There is a long list of differences.
Not impossible but hard and would require a lot of rebalance of the AoE1 part.