Hello @ava691975902 ,
When looking at transistors from Toshiba there are a large number of suffixes that are added to end of the part number that are often not called out in the manufacturer data sheet.These are often calling out packaging and RoHS status and do not have an effect on the part specifications per this TechForum post.
It can also be verified the same part by looking at “Other Names” (former part numbers) at the bottom of the non-M suffix product page:
Regarding RoHS, sometimes the part is already RoHS compliant, and the manufacturer updates the part number to include the RoHS call-out. If the part was not formerly RoHS compliant, then they would issue a PCN or part change notice which would typically be listed on the product page. In that instance then the PCN or RoHS change could affect the part or solderability of the part. I didn’t see any PCN’s associated with this part number, so again it looks to be the same part.