Brake question

[Harry Moon]

Does anybody see a technical or operational issue with using 1.1/2 inch wheel brake cylinders on the front brakes as opposed to the original 1.3/8?
I'm installing the larger axle on my C60L with the wide brake shoes, the original wheel cylinders are the same physical size as the commom rear brake cylinders, WC4511, but instead of the larger bore they have the same smaller bore as the WC4517. Can't find a part # and as the units are in excellent condition I'm thinking of rebuilding them. But I have some 4511's in stock and they fit but does this change make a difference? I have to think they did it that way for a reason as it would have been simple to use the same rear cylinders but they didn't....