If that mattered Italy, Ottomans, Bulgaria, Romania and the USA wouldn't have joined, Russia already knew from their war with Japan and dived right in.
In 1914 there was no A and G variants of plan 19, indeed they even half-arsed the 1913 G variant in favour of the A variant. The difference between A and G was that the 7th of the 8 Armies mobilised, the one coming from the Kuban area, would be so late in arriving (6 weeks after mobilisation) that it could be diverted to the north to reinforce the 2 armies facing East Prussia or south to reinforce the 4 armies facing AH.
In July 1914 the new plan 19 was released, a hybrid between the existing plan 19 and the looming plan 20, the main difference being that Russia planned to mobilise 10 rather than 8 armies. 2 would still face EP available on week 2, 4 would face AH available on week 4 and the last 2 to be sent to face the German-Silieisa/Poland border on week 6, with 2 armies held back to face the Ottomans and others.
In the event these 2 armies were split and one sent south and the other north.
What impact though for the war as reported in Britain with an election pending sometime in 1915? I concede the leadership may not care the price in lives but the voters whose lives are going to be gambled might? I think most of the other nations saw this war as very much one of survival, you win or you are dead. Was that sentiment in Britain down in the streets?
My understanding was that Plan A was the more defensive one, a sit and wait to mobilize and let Germany attack because Russia is big and we have more peasants to lose until we attack and overwhelm them. G and then 19 and later 20 are evolving a more offensive approach spurred on by France. In other words Plan A was the initially defensive plan abandoned before 1914? Again, I understood Plan 19 to allow for a shift of one Army either North or South from the beginning. If correct, or in the alternative allowing for follow on forces, do the Russians have the flexibility to shift more than token forces to East Prussia if their intelligence reports "more" Germans? Do they bother or are they confident that their 1st and 2nd will handily deal with the 8th and "X" Army as they get after A-H per OTL?