relys old and new

[R&D man]

When I do my engine swap from m20 to m50 do I re use the three relays (fuel pump etc) in the black cover .Or do I need the relays from the doner e36.?
By the way I think the r3vlimted is a good resource.

[RoadHazard]

From the E36.

[Schwarz325]

Use the whole wiring harness from the e36