It is not uncommon at all for any species to change body form many times across their life-span. The ease with which they can do so depends on the continuity's technology level. In some, changing bodies requires an extensive full-body rebuild and tends to be resource-draining and even dangerous. Sometimes, however, all it takes is to transplant their brain or personality program into a compatible new body. Other times, the existing body itself will be "reformatted" on the spot using a scan of a local compatible alt-mode.
Getting a new body sometimes also involves getting a new name.
Bumblebee turns into a Urbana 500 after repairs.
Cliffjumper turns into a Dodge Challenger after upgrades
Jetfire turns into an Ann-225
The Three Seekers turn into F-22 Jets
Demon Generals gets reborn into Sith Transformers Bodies
Captured Jedi and Galactic Alliance Troopers gets turn into Death Troopers and Kaleesh Human Hybrids
General Grievous's body becomes a scary creepy evil Darth Grievous body
Transformers (like Shockwave) gets corrupted into serving the Sith
jedi gets seduced to the dark side and might have an alter of clothing when they become Sith Lords
Evilifier virus mutate things into evil creatures ready to attack
Any creature that hatches from chrysalises or cocoons became monsters serving evil