I own a 97 Honda Accord, and it shifts really hard after changing a rear main seal?

I dropped my transmission to change the rear main seal, and while it was out, it tipped over and All of the transmission fluid fell out. So I went to Autozone and bought a gallon of the store brand Trans fluid. Would that cause it to shift hard? Before the repair it never did that. Hoping it's that, and not the fact of it tipping over and breaking something inside. I've been reading some stuff on the internet, most forums say to put in the Honda ATF Transmission fluid, is that required? Or when just another good brand be the same?

Added (1). It's an Automatic FYI.

You need to run the engine at idle speed, then top up your transmission with red fluid and check the level on the measure stick. Power steering fluid / ATF.I own a 97 Honda Accord, and it shifts really hard after changing a rear main seal - 1

Used wrong fluid. Need to use Honda recommended fluid which is why the hard shifts

If you didn't use Honda recommended ATF you made a big mistake! After draining and filling the tranny you'll need to drive several hundred miles to let the correct ATF saturate the clutch packs before it shifts smooth again. You may even need to change it several times.