In the 1980s they had the RPO-A, RPO-D, and RPO-Z, plus also the disposable RPG-18 and RPG-22 as well as the reusable RPG-7, RPG-16, and RPG-29.
The RPG-7 has endured because it has been adapted to take larger and larger calibre rockets, while the other systems have been growth restricted by their fixed calibre.
The RPO series has been upgraded with the RPO-M system with a new gripstock and updated rockets that are more powerful and have better effective range while being lighter.
New systems include the RPG-26, RPG-27, RPG-28 disposable launchers firing anti armour rockets in 72.5mm, 105mm, and 125mm calibre, where the second two have tandem warheads with a small precursor charge in its nose to set off ERA.
The RShG-1 and RShG-2 and RMG are engineer rockets with thermobaric warheads that are the direct equivalents of the RPG-26 and RPG-27 with the matchup being both the RPG-26 and the RShG-2 are 72.5mm calibre rockets that weigh 3kgs and 4kgs each respectively but the former has a single HEAT warhead and the latter has a thermobaric HE warhead.
The RPG-27 and RShG-1 are both 8.3kg 105mm calibre rockets, but the RPG-27 has a tandem HEAT warhead while the RShG-1 has a single thermobaric HE warhead. The RMG has a tandem warhead arrangement with a nose mounted HEAT precursor charge and a thermobaric HE warhead to the rear.
The RPO-M family includes an A, a D, and a Z model that are thermobaric, smoke, and incendiary warheads respectively with a calibre of 90mm they are slightly lighter but longer ranged and more powerful than the old RPO-A, RPO-D, and RPO-Z that they are replacing.
The new reusable gripstock looks the same as the one for this new 62mm Bur light weight rocket so I expect they might have new models of the MRO family of rockets as well. The old RPO rockets were quite heavy at about 12kgs each, and the new RPO-M reduces this weight to just over 8kgs per rocket. The original weight of the old RPO rockets meant they developed the MRO family that had a smaller calibre to reduce their weight to just under 5kgs. Whether the new Bur 62mm rockets replace the 72.5mm MRO or not I don't know, but I suspect that the old Shmel (RPO-A/D/Z) will be replaced by the Shmel-M (RPO-M) and that the MRO will be replaced by the Bur as a lighter handier alternative.
Using one gripstock to load RPO-M or Bur rockets makes sense but will they extend it to create a unified unguided rocket launcher that can launch light and heavy anti armour and anti material (HEAT and HE) rockets.
If there is a reloadable launcher for current disposable rockets will it be like the RPG-32, or a gripstock like the one for the Bur and Shmel-M?
I like the gripstock idea because it does not limit the calibre of the weapon and calibre is very important for penetration for HEAT warheads.
The RPG-29 for example can't fire the rockets developed for the RPG-28 because the RPG-29 is 105mm calibre and the RPG-28 rocket is 125mm in calibre.
Of course developing HE rounds in 105mm calibre make sense as they can also be used on the RPG-7 and RPG-29 and are used in the disposable RShG-1 and RMG launchers, but there is no need for the weight and calibre of a 125mm HE round as the only current 125mm weapon is disposable.
There was talk of fitting the 125mm HEAT rocket launchers to light aircraft and helos as anti armour weapons but nothing seems to have come from it... but it is perfectly possible that light UCAVs might deploy them as very cheap anti armour weapons.