If you miss the DX Leo, get another. Keep throwing the Pro Leo, which likely flies like your DX Teebird, and it will work in as well. I feel the Pro Leo and DX Teebird are more similar in flight for someone throwing sub 300' than a DX Leo and Pro Leo, especially until it beats in. The farther you throw, the more different all of these discs will be. When I was throwing 280-300', and the Pro Leo was my first fairway, it was dead straight. But if I threw one with my current power it would definitely turn, so it depends on form level. They are good discs, but more stable than DX for sure even though the printed numbers are the same. Keep using it, let it beat in, and get the technique up.
I definitely bag multiples of some discs, some in different plastics and some in the same. You'll get to figure out what you like, and also find that just because the stamp is the same on some discs they don't fly the exact same. But sometimes they do. Got to learn how to pick them.
Also it's worth saying that many discs I have bought I didn't like at first, but I knew I would grow to adjust to them and they would also wear in. Especially if I try one that someone has had in their bag for 6+ months, then buy one brand new I know it won't fly like that until the new is knocked off of it. Once you've worn in a couple of discs you'll know what is the mold's long term characteristics, and what is the "fresh disc fade" or newness factor vs. how good you know it should fly after some rounds with it.