I don't have a concrete answer for you, but I found your post interesting as I was under the impression that most slatwall systems had compatible accessories as
router bits for making "standard" slots (5/16" x 1-1/16" with 3/8" groove) are available. I just bought a bunch of panels at auction and was considering
Sam's Club - SlatWall Hooks Set - 35 pc. or
Spacewall International: Slatwall Chrome Brackets. Now you've got me wondering. Have you measured your slot dimensions and compared with other systems?