All good buddy, it is a sensible thing to get straight in your mind before commiting.
Yep, they will be near identical.
The Keychain thickness may well replicate the distance of you implant under your skin.
This is your Phone, NOT implant related
Check out
?Most? of the Blinky you will see, will be the xSIID…this has a chip and the reader will perform differently, and “better” for showing off…
To me it sounds like you may want to upgrade to an xSIID