[Henry Schmidt]

If the cylinders are in good condition there is no reason not to use them.
That said, the issue will be fitment. Cylinder to piston clearance.
The are 4 different diameter specs for 95 mm cylinders.
0-3
If you buy a "shelf" JE piston you will get a piston that will most likely fit a 0 or 1 cylinder.
If you have a 0 or 1 you win. If you have a 2 or 3 cylinder you may end up with a larger than desirable piston clearance.

Check the cylinder for ovality and surface condition. When you measure for ovality, you should know you diameter and that will allow you to order a JE to fit your application.

You might also concider machining your Mahles for valve pockets. It will only slightly reduce completion and substancialy improve you wallet thickness.

10.5 is pushing the envelope for single plug engines, race fuel is required.