Is the Compost in a Grow-Bag different to Multi-Purpose?

in Fruit & veg
I'm only asking really because I'll be growing my toms in containers and in previous years I've bought grow-bags for the compost.
Clay soil - Cheshire/Derbyshire border.
I play with plants and soil and sometimes it's successful
I play with plants and soil and sometimes it's successful
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Multi purpose, I suppose, is more of a general, vaguely longer term sort of thing for plants that will be given liquid feed from time to time.
Maybe.
If you live in Derbyshire, as I do.
In the past, people often bought grow bags once they were reduced in price, because it was then a better deal than bags of compost.
I live in west central Scotland - not where that photo is...
Grow bags in a blown way, and MPC in tubs both in a greenhouse and outside, and didn't see any difference. The only reason I had was cost. I only had a small garden before, so a couple of grow bags was all I needed. Now I use more it's cheeper to get MPC in multi deals.