I haven’t tried it, but I don’t think they would go.
The Perry plastics are exquisite, ‘true 1/56’ (i.e. titchy) more or less realistic proportion, scale model people.
The Warlord plastics are their usual exaggerated, chunky, ‘Commando comic / War Picture Library’ style, heroic stature 28mm. Substantially larger and in a totally different style.
I’m sure you could kitbash them together. I think they’d probably look somewhat weird though...