Hi!
https://testpilot.ru/russia/myasishchev/m/20/index_1.php
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The M-20 variant I is based on the layout of the M-20-1, M-20-2, M-20-5, M-20-6. The estimated take-off weight of this variant was about 150,000 kg;
M-20 variant II - based on the layout of the M-20-7, M-20-9 (aircraft with a laminar bypassing system), M-20-10, M-20-11, M-20-12, M-20-14, M-20-15.
M-20 variant III - based on layout schemes M-20-16, M-20-17, M-20-18, M-20-19, M-20-21
The M-20 variant IV is based on the layouts of the M-20-22, M-20-23 with a wing of variable geometry, M-20-24 with a system for controlling the fairing of the wing. The take-off weight of aircraft of this variant - 300,000-325000 kg, with the use of outboard fuel tanks estimated take-off weight reached up to 345,000 kg."