The answer here is a simple yes. Every year there are little to no enhancements in the model lineups. Toyota 4Runner was last redesigned in 2010. Since then, every model year there are only simple enhancements now and then. So whether you own a 2015 model, 2018 model, or a 2023 model, they all will fit well with the same size of seat covers. Thus, if you ought to buy covers for the 2023 model, it will also go well with your 2018 model without any issues.