Is Canadian football similar to American football? Could the teams play against each other in a hybrid game?

It was done as late as the 1970's. The CFL field is longer and wider, with larger end zones and different placement of the goal posts. The CFL allows multiple men in motion at the snap, has the rouge, three downs, and does not have fair catch. Among other rules differences.

no it is not similar

it is two things differents

They are similar, and both descended from rugby, but there are many differences, like:

-Canadian football having 3 downs instead of 4

-Canadian football having a 110-yard field instead of a 100-yard one

-Missed field goals that go out of the endzone giving the kicking team a single point in Canadian football.

I included an article about it in the sources.

Could you seriously be any more stupid than to ask that question?

It's similar, but the size of the field, the scoring and the rules have some variation. There's enough difference that they could play one game or the other but not a hybrid game