I don't know if there's any advantage to having practice rounds "feel like" defense, carry rounds.
Even if they are identical, the difference in adreneline will eliminate any similarity in bullet recoil, trigger weight, etc. I'd guess any tendency to "limp wrist" the gun would vanish under stress.
Practice enough with the "real deal" ammo to assure yourself that it feeds reliably. Then just "play" with the cheaper home-rolled cast wheel weight bullets to reinforce good habits (like remembering to take it off "safe" before shooting the bad guy
)
Regards.