You shouldn't have any issue with different shocks.
Also, when ever we fix a collision, we only replace the one that was damaged, thats all that the insurance will cover. So there are tons of vehicles with 1 of one type of shock or strut and 3 of another, and also many with different ones from front to back.
Ps. I have 2 different brands on my truck, dw's tahoe and probably at least one of my cars
MillerTime- Future Sabre Handler!!