Can a dwarf have a coffin AND a memorial?

Solution 1:

After some messing around I've determined that dwarfs can get both treatments and it doesn't matter the order in which they are done. Dwarfs who are already interred in my catacombs have their names available when engraving slabs as memorials, and dwarfs who I gave memorials to have since been buried as their remains have been found.

Additionally, Dwarfs who have memorials are still listed as options in the Engrave Memorial Slab menu, which also lists whether or not the dwarf has any existing memorials. I assume that this means I can engrave multiple memorials to the same dwarf, though I haven't tried it.