I have being wearing Slim Dungarees and p10-ds quite often. Personally they both got similarities as allday pants but for sure quite obviously differences under the water too.
Slim Dungarees was a no doubt with the jeans heritage inside of it. Five pockets, low profile active pattern and relatively affordable prices(having mine at 2017 as the corepack).
P10-DS was a biker friendly pants since its basiclly built based on the idea of that.
P10-DS in size m and SD in size 32, the result of that was SD doing some profile fit and p10 and more easy to embrace some stacking or roomier for way more jutsued movement.
both items are solid to me. mine DS version was made in NY and P10-DS was made in EU. There are some small rips on the SD but i believe the workcloth is more like the CH cloth schoeller provided than the Dryskin one.
these are two quite inreplaceable items.