Pivot size and shape are identical, yet not all tools will fit every tool or every stlot.Long tools will only fit on the outside and teh choice of shorter tools in the middle slots is somewhat limited on the shorter MP 400 chassis.Then you have to keep the differing thickness in mind, when combining unusual tools, you may have to use shims.Show us what you create!
Before buying whole tools for single implements, don´t be shy to ask around here - Many members have a parts box.