I was able to carry out a search and, according to my research, the manufacturer uses the same manufacturer numbers and EAN codes. Therefore, it is unfortunately not possible to say clearly which revision of the product would arrive. So manufacturers can make changes to the products without generating a new product, that's my guess.

### Difference between the 420 and 360 mm versions - Radiator size: The main difference lies in the size of the radiator. The 420 mm version has a larger radiator, which can generally lead to better cooling performance at higher loads, especially in large cases with sufficient space. - Cooling performance: The 420 mm version tends to achieve slightly better temperatures at high loads, although the difference is often small and depends on other factors such as case ventilation and the CPU. - Installation and space requirements: The 420 mm version requires more space in the case, which can lead to compatibility issues with smaller cases. ### Compatibility with the Thermaltake The Tower 300 case - The Thermaltake The Tower 300 case generally supports radiators up to a size of 420 mm, provided there is enough space for mounting. However, it is advisable to check the specific dimensions of the case and the radiator to ensure that mounting is possible without any problems. ### Thermal paste - The Liquid Freezer III - 420 A-RGB comes with ARCTIC MX-6 thermal compound pre-applied. So you don't need to buy or apply any additional thermal paste unless you decide to use a different one.

I don't think so have a look at the Arctic page

I have the Lian Li O11D EVO RGB, where the fan fits into the lid (you have to work precisely if the mainboard has full connections). Overall, a very spacious and excellently finished case.