New member here a bit confused still after many searches so please go easy on me!!! I did search many times but only get confusing answers that it will fit and that it wont fit

My dilemma: I have a 98' Blazer LT 140K miles on it, transmission shift from 1st to 2nd gear and then rev up and won't engage 3rd gear.....some times it will engage 3rd gear but is a hit or miss and will never engage 4th gear.

I got a donor 02' Blazer LS with 110K miles and my big question is: Will i be able to swap this tranny to my 98'

I did check both RPO codes in the glove compartment and both says M30 ...But looking up M30 gives me many variances of the same 4 speed Automatic tranny