SC (the Soldier's Companion ruleset by GDW, now published by Heliograph) gives a great deal of useful information on building Martian states and armies, and it is as good a starting point as anything for building up scenarios and "consistent" backgrounds for battles and campaigns.
The norm in SC is for units of 20 foot or mounted (including 3 or 4 officer/NCO figures). The implied scale is about 1:10, and the British army has 4 "companies" of 20 figures making a full battalion which confirms this. It also states that "most Martian Regular infantry is armed with smoothbore musket as well as some sort of melee weapon" which somewhat belies the typical 50/50 split of a Martian band between "cutters" and "shooters", but we'll go with the flow. For random cities, the base force strength is 2 bands of infantry, 1 band of mounted and 2 guns per "army number", so your basic building blocks are of 60 figures plus 2 guns.
But as I want to use Piquet's DoB2 (Din of Battle 2) in company scale, I need to do some translation work. Company scale in DoB2 has each infantry unit (12 figures) representing 80-150 men, and an 8-figure mounted unit representing 40-80 men. A gun model (and 3 crew) represents a gun section of 2-3 guns. We're therefore talking about a similar figure/man ratio to that used in SC.
In my "typical" regular Martian unit I have a 4-company battalion consisting of
- 2 companies of infantry armed with muskets
- 1 company of infantry armed with polearms
- 1 company of infantry armed with jingals and rockets
That's 48 figures, and is close enough to the 2 bands of 20 infantry in SC. The 20-figure mounted band will be represented by 2 troops of 8 mounted under DoB2. That's 64 figures in all, so pretty good. And 2 gun models is 2 gun models, as both rules sets have a model representing a gun section.
SC also attaches both mounted and foot mercenary bands to much of the regular forces, again on the 20-figures per band model. I'll therefore have each band represented by two DoB2 units of the relevant type. That's overweight in infantry and underweight in mounted but balances out fairly well. I haven't decided whether I'll split the foot units into one each of "shooters" and "cutters", or whether I'll have them as mixed-weapon units. Splitting will make them more specialised, but also less versatile. They are intended for "light scouting and skirmishing" duties, so versatility would seem to be more appropriate, and it would also help to differentiate them from regulars. Time will tell.