Russia has had the opposite problem of not enough material and industry. They have enough armored vehicles for every soldier to ride one but barely enough infantry or maintenance crew. They have thousands of artillery pieces and not enough people to man them.
Ukraine has the problem of not enough material and industry, but too many people such that they only get handed 10 bullets, still have Mosin Nagants and have to use civilian trucks.
I don't think at this stage we have any good evidence as to just how much operable and effective materiel and vehicles and fighting equipment Russia has. Pulling out T-62s, while it is technically an armoured vehicle, is not exactly inspiring or reflective of warehouses stocked with modern equipment, even if it is for reserve and rear echelon forces.
Depending on how the next few months of combat and western supply of equipment goes, it may very well be that the mobile and combat effective Ukraine units conducting major attacks are better equipped than most Russian equivalents, even if the average Ukrainian unit is less well equipped.
Overall, my point is that with the addition of 300,000 troops, it's still up to us to see how well Russia can use them or equip them.
Given how Russia has prosecuted this war so far and how half assed they conducted the initial invasion and have been making it up on the fly since then, we should see if they have half assed this call up of 300,000 reservists as well. Personally I don't think they did, I
assume they've done the proper planning and laid the foundations to get them into a pipeline for using them to their most effective potential... but their conduct of the war so far has not inspired confidence.