AC R134a Retrofit

I have a 7 blade clutch fan with a shroud and the condensor is a stock type
two row. I didn't add any insulation to the cabin but it is a factory AC car so it has tinted glass.
I thought A bodys came with a cycling switch installed from the factory.
I have 60 psi on the low side at idle and the 40 psi at 1200 rpm. I didn't want to overfill it and have to high pressure readings.
Is there a difference in the type of 134? I just used Autozone 12 oz cans.
Thanks for the help.