Russell's huge crash during practice at the Mexican GP led to the Brit using a Silverstone-spec floor for the rest of the weekend, while his team-mate had an updated version.
Despite this, the performance of the two cars appeared to be very similar, with Russell clearly benefitting from less drag down the main straight at the Autodromo Hermanos Rodriguez during the pair's battle in the race.
Blame was pinned on car problems for Hamilton's spin at the US GP too, a spin which ended the seven-time world champion's involvement in that race.
Will Mercedes win the championship in 2025?
The varying levels of performance, and seemingly sporadic car problems, have left Mercedes scratching their heads all season long.
However, performance has dropped off a cliff since then, and the team are languishing in fourth in the constructors' championship.
Now, Shovlin has confirmed that the Brackley-based outfit will be switching their full focus to 2025, when 18-year-old Kimi Antonelli joins the team, with no new major upgrades planned for the W15 between now and the end of the season.
"It is certainly a good opportunity for us to do a bit more experimentation in the race weekends, but the key thing for us is making sure we have done the important bits of learning ahead of the 2025 season," the Brit told Mercedes' Mexican GP debrief.
"We are not bringing any more major updates to the car, it might be that we have some test items, some small bits of bodywork that we are looking at but again this would be very much in the context of learning for the future.
"There will be lots of opportunity to do set up work, lots of opportunity to use the two cars to compare different approaches and hopefully over the next few [races] we can just add to the learning that we have already made during this season."