I suspect the difference is in how the R value of the fiberglass insulation is calculated for product labeling.

If the fiberglass is only for preventing blown cellulose from filling an exterior eave soffit, part of it should be removed later so that air can pass from the perimeter soffit vent into the attic. A good way to do that is to install some kind of foam or cardboard baffle between the rafters and block the space below it with fiberglass.

Okay. The house is 30 years old and has been stuffed with fiberglass at the at the soffit. The difference is I just threw out the old insulation and put this new stuff with Baffles. My only concern this insulation on the packaging says "Walls" but other ones says "walls and attics". I cant find seem to find the difference at all.

https://www.homedepot.ca/en/home/p.r-20-ecotouch-pink-fiberglas-insulation-spacesaver---15-inch-x-47-inch-x-6-inch-783-sq-feet.1000181137.html?AID=10678183&PID=7816318&SID=skim82462X1534048X0c04b7075e0daff0d24ef4567dd64c22&cj_linkd=10678183&cj_webid=7816318&cj_sid=skim82462X1534048X0c04b7075e0daff0d24ef4567dd64c22&cj_affid=2617611&cj_affname=Skimlinks&eid=Redirect%20Link|affiliate|comm-junction||EN||||||10678183|

There is no difference in the material; the insulation to which you linked is cut to fit 2x6 stud walls and the manufacturer chose to omit the word "stud".

Owens Corning makes fiberglass batts for walls from 3 1/2" to 6" thick.

Attic insulation is usually blown in but they make batts for roof/floor/ceilings from 6" to 12" thick. They also make it in various widths for older houses.

no difference aside from various widths & thicknesses.