I may use an npp from a diff source than the prop. Right?

Of course bro........ thats not a problem, what we try to create is a stack lets say like yours which is prop/NPP consisting of the same brand prop... and the same brand NPP.... meaning all bottles of prop come from lab A and the NPP all from lab B...... this ensures to a point that purity is consistant between both both compounds which leads to a far greater stability level with blood plasma... (not absolutely paramount with short esters as we need to be with long esters but!.. still of importance) for a successful near side free cycle..... troughs and peaks in blood plasma levels is the most deciding factor in experiencing bad side effects in my opinion, so keeping stable anda little understanding about half-lives and half life ester cleave timings will help anybody to veer off bad sides...... this skill becomes more important when running 19s and heavy androgens than normal simple testosterone runs............ in my eyes everyone should do deep research before hitting a heavy androgen/DHT run to be fully prepared how to encounter the sides has they gradually creep up on us..... i read all sorts of shit on here about how Ai use combats bad sides!... that is pure shit written by people who have little to none knowledge about running steroids for long periods, but it is the responsibility of us all as individuals to find what works best for us instead of following cookie cutter type shit like it is religion, many do this and fail consistently simply because they lack the basic brain power of following instinct and experimenting for themselves.