Connecting multiple ATmega328p's on same power rail

When connecting multiple ATmega's on the same voltage rail would it be advisable to be using resistors to make sure the current is split evenly across the 2 ATmega's.


No. Each 328 will pull the current that it needs.

You need individual VCC and AVCC 100nf bypass capacitors for each processor - as close as physically possible to the chips. 2 x 328’s = 4 caps, minimum.

Add a 10 to 100uf (minimum) electrolytic cap for VCC where it enters the board as well.