no you should not have any issues with the paint being different. my trade is bodyand paint were the hood and fenders primed seperatly at a different time? temp. or air pressure could of been a factor in the difference in colour or even mixture of hardeners and or reducer
He's right you shouldn't have a problem. There are still techniques in painting like fogging the base on last coat to make sure color is uniform with pearls etc.. I always use 3-5 coats filler primer on my paint jobs why i don't get the shade difference. If you can keep texture to a minimum seal off car with reduced epoxy just before you spray the base.
finishing the body and paint is still a good ways off, there's other stuff to be done first. I just thought I'd ask y'all if it'd be alright. I don't trust our local "expert" that much after seeing his "custom" jobs.
The only way you are going to get that perfect job is use filler primer and block the car to remove all the waves/imperfections. I never spray a car unless it has been wet sanded 600-800 minimum or you will just end up using more paint to fill in sand scratches. You can buy spray poly to save money but it's hard to sand. I use K38 filler primer blocking first few coats with 180 then i spray some more and block 320. If i paint right over filler i wet sand it 600.. Alot of times i will reduce expoxy as a sealer using shopline it's cheap and works. Just be careful when using k36 or 38 it can bridge at the corners of a panel if you don't let it flash properly between coats. As for shine you will get the best look using ppg 2021 or 2002... I use 3 coats and will sometimes cut the car and put even more clear on. It's alot of work but there is only one right way to do all this.