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The shell size for a 25 and a 25.5 is always the same - the only difference is the liner thickness, or more commonly now it's just the thickness of the stock insole that's different.
You could put that liner in that shell but it won't be ideal at all. If the liner fits you now, it will get sloppy. If the shell fits you, get the liner stretched to fit the shell and it might be alright.