Nearly.
I DIY upgraded from High Performance to Super Performance, that is I already had the 380 mm front brakes and I upgraded the rear 326 mm to 376 mm.
About four years ago now, I have a thread about it around here somewhere.
The 326 mm rear brakes on both the Performance and High Performance are identical including the calipers.
The rears were easy enough to do and upgrading the fronts from 355 mm to 380 mm will be just as easy if not easier, both are simple bolt up "plug and play".
Only one potential problem upgrading the fronts, the expense of the 380 mm parts. You will definitely need new rotors and pads but you can get away with used calipers and caliper brackets which sometimes can be found going relatively cheap on Fleabay etc, at least a helluva lot cheaper than new which cost a bomb. Also if shopping for parts remember that the 380 mm brakes are 100% identical across a wide range of Jags including XF, XJ, XK etc so no need to pay an "F-Type tax" on them.
The rear brakes are a different matter though you need F-Type specific versions to upgrade them.

Edit - forgot to add - one more hassle if you have a base with base wheels and you are looking to upgrade the front 355 mm brakes to 380 mm.
The base 18" wheels won't fit over the 380 mm calipers and you would need to upgrade the wheels to at least 19".

 

Thanks

Our base car was equipped with the 20" upgrades delivered to the dealer as an option add on. Not sure if it was a dealer car ordered that way, or if it was a special configuration from a customer. So it seems I'm good to go in that department.

We aren't tracking the car so I think I will just look to add the larger 380mm front brakes. Unless I find a good price on both front and rears.

 

Yes, the 326 rears are the same.