Mini Starter .....Why?

Ok why does everyone say you need a mini starter for the swap. TTI told me and numerous others I used the original starter that came on my 04 truck 5.7 with no problems with both the 5.7 headers and the 6.1 headers. Is there a difference in factory starters or what. Just curious mine is done but I still see alot of people on here saying they have to get a mini starter.

I think that by "mini" they typically just mean new like many have said. Pretty much all factory starters are "mini" compared to what was on my 318 when I pulled it out of the car. That's at least how I interpreted it.