It will likely work, but cannot be guaranteed as this is meant specifically for the PMAG's from Magpul.
Yes, they should work just fine together.
The Magpul Industries MagLink Coupler PMAG 30/40 AR/M4 will not fit those magazines.
No, the Magpul Industries MagLink Coupler is only compatible with 30 and 40 round PMAGS.
Yes, the Magpul Industries MagLink Coupler will be compatible with Gen 2 and 3, 30 and 40 round PMAGS.
The Magpul Industries MagLink Coupler will not work with Ruger Mini 30 magazines.
The Magpul Industries MagLink Coupler will only work with the following magazines. Fits 5.56x45 PMAG 30 and 40 round AR/M4 GEN M2 MOE® and AR/M4 GEN M3™ magazines.
This is what the manufacturer states about compatibility with the Magpul Industries MagLink Coupler. "This MagLink is NOT compatible with first generation PMAGs (with Black follower circa 2007-2009) 10 or 20 round PMAGs custom branded PMAGs or any other non AR15/M4 specific Magpul magazine such as the EMAG PMAG 30G or PMAG 30 AUS."
No, these are made specifically for the PMAGS.
Yes, they will work just fine.