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A few of the Marine tanks (Sicaran, Spartan, Scorpius...) got ported to 40k as 'relics of the armoury' in Imperial Armour 2, but IA1 (the book with all the general-purpose Guard stuff) came out before the Militia list. If I were you I'd pitch a set of restrictions allowing you to use a few of the 30k vehicles to your group based on those rules (CAD only, no duplicate Relic vehicles, and some of the guns/options get toned down).

For instance: the Spartan in IA2 is almost identical to the Legion Spartan (it's 10pts cheaper because it's running off an older version of the Legion list); the only other differences are that you can't get any 30k-specific vehicle upgrades. So if you wanted to pitch an un-mothballed Dracosan as a Guard vehicle in 40k it should probably be a 0-1 Heavy Support choice, available in a CAD only, with the same cost, profile, rules, and options except for the Flare Shield and Auxiliary Drive, which wouldn't be allowed.

As for the Russ Incinerator I'd say probably not on principle given how little volkite is left in the galaxy; if Marine relic Land Raider Achilles have lost their volkite guns nobody's maintaining them on Russes.