I currently have a 68-122.5mm square taper bottom bracket on my hybrid. I'm replacing the stock SR Suntour chainset with an SRAM S600. I read that the SRAM S600 chainset is for 113mm bottom brackets. The technical specs of the SRAM S600 chainset appear to be the same as my SR Suntour in all other respects.

Am I correct in assuming that I will have problems? I thought square taper was square taper so am confused as to why the BB spindle length actually matters.