I read someplace (yeah, I know), that the 40gr. CCI Blazer ammo is made by CCI, while the newest 38gr. offering is put up by Federal. I read that on rimfirecentral.com, but I cannot verify it personally. Maybe looking at the SKU numbers will tell the tale.
CCI 40gr. Blazers shoot pretty well in most of my rimfire rifles, but I haven't messed with the 38gr. LRN loads yet.