Switching rims

[Cubfan]

Jaguar 2005 XK8 convertible… My stock rims are 245/45zr18 front and back.  I purchase some used rims that are supposedly from the same model but they are 245/40/19 front & 255/40/19 back.  I wanted to confirm that I can replace the old rims with the new rims before I purchase the tires.  Can anyone help?  Thank you.

[Tango34]

as long as nothing rubs your all good, normally a one inch jump is ok, and also it will transform the cars look