Mixing Hotchkis and Other Brand Shocks

So, it looks like Hotchkis rear shocks 71020015 are out of stock everywhere indefinitely. Summit shows a ship date in June. I have the fronts, 70020013, but was waiting to get the rears, and now I'm stuck. How about using Bilstein rears? OR Qa1, Viking, etc.? Do they mix?
I'm using Hotchkis HSS-24385 -1" springs.