I just checked the Rovers North catalogue and they are different part numbers. I know that the cylinders are different on every corner and I am guessing that the bore in the cylinder is different front and back to "balance" the system better.
My 1964 88" has rear backing plates, shoes and drums on all four corners, but the cylinders on the front are still from the fronts and I think Mark Nault from Wise Owl mentioned this specifically because it is important.
Check your cylinder bores and hopefully they won't be as bad as mine were. I had to buy a hone. Oh well, at least I have one now.
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1964 Series IIA 88" 2.25 L Petrol
some rust, not one straight panel 
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