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AFAIK that dry foam comes in a can which has a clip to hold the nozzle when not in use - using that clip puts a kink in the flexible nozzle, effectively sealing it (and preventing air from getting at it, causing it to cure). Not seen gun grade low expansion foam in quite a while - standard expanding foam and the newer blue fire foam, yes, but not the low expansion stuff
J&K - that pinkgrip and the equivalent Instastick are low-expansion foams with added adhesive. Instastik is available as both regular and gun grade https://www.screwfix.com/p/dow-inst...Lq_mTSzR0RCCo2srEcQaAhXMEALw_wcB&gclsrc=aw.ds and that pinkgrip has a dual mount that allows either the regular nozzle or a foam gun to be attached
"Pinkgrip Dryfix FR is a revolutionary type of fast-curing adhesive foam that has been specially developed for the rapid installation of plasterboard, insulation boards and other sheet materials such as roof decking and floorboards.
The new Dual Flow system means that Pinkgrip Dryfix FR can be applied using the nozzle provided or attached to the Dry Fix Applicator Gun. Providing significant labour saving and convenience benefits when compared to traditional dry wall adhesives, it will bond to most common building substrates and can be applied horizontally or vertically to the board, wall or battens/beams. The foam expands very minimally on application but enough to fill any gaps on uneven surfaces."
I have extensively used both recently and nothing to choose between the two brands as far as I can tell (except one's pink)