The old one looks great, as does the new one. I'd definitely keep the old one though, "just in case." I tend to fall on the side of
@VDL_Piper in that I love the unique way some objects age and tell a story about the owners. Old violins can easily be used for hundreds of years and even the humble ones that are still in use tell a lot to those interested. To family members, personal effects like your old pouch are even more interesting if they show signs of a long life of honest use. I treasure my dad's old daily tobacco pouch all the more for its wear and tear. Keep that old one, it might be held in loving esteem by a future family pipe smoker or maybe just a sentimental descendent.

Edit: I'm pretty sure the pouch pictured above was from the late 1930s or early '40s.