I cannot help with the other engines, but I have this data from my own engines. Hope this helps.

DA50
Engine
spark plug
ignition module
prop washer, nut
49.4 oz

Slimline Pitts muffler 10 oz

total 59.4 oz -
plus standoffs (approx 2 oz), ignition battery (4 oz), ignition switch/harness (1.5 oz)

total including mount, battery, harness
approx 67 oz.
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Moki 1.8
Engine
glow plug
prop washer
tru-turn spinner nut

42.3 oz

Moki backplate mount 7.1 oz (Great Planes jumbo adjustable nylon mount is similar weight)
Bisson pitts muffler 6.8 oz

Total w/mount and muffler 56.2 oz
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Wolf Predator 1.8 Model B (I own 2 of these gems)

Engine, spark plug, prop washer, spinner nut, venturi tube, rear plate mount
41.1 oz

Ignition module w/foam 4.1 oz

Bisson inverted muffler w/bolts 5.4 oz
Bisson wraparound pitts muffler w/bolts 7.1 oz

All up including battery (4 oz), switch harness (1.5 oz)

Total = 56.1 oz (inverted muffler), 57.8 oz w/wraparound pitts muffler

Since it requires less fuel, the Wolf actually has a flying weight significantly less than the Moki 1.8, although it's not quite as powerful. Both swing a 19x8 Mejzlik. 7100rpm on the Wolf, 8800 on the Moki.