DIfference between vanquish level 3 and 4

Hey all, sorry for all of these questions. You might have seen me all over this forum lately, but that is because I'm finding this community really helpful in helping me finalize my configs

I was wondering if there will be any overall noticable difference in performance between these two vanquish configs that I'm deciding on. Also, is there any hidden differences? Both of these configs have almost the same components except for the cooler.

Vanquish level 3 1524873     

Vanquish Level 4 1525154

Basically, one of the only differences that I know of is that level 4 has the liquid cooling while level 3 has some air fan that I know nothing about. I did email digital storm earlier to try and find out what the air fan is and if it will be safe to have them overclock it any, but I haven't heard back yet. While I'm waiting for their response I would love to hear thoughts on all of this from members or people with more experience with overclocking than I am. Do you think I should set the option for them to overclock to 4.4 ghz with level 3? Or should that only be in the realm of level 4?

I would definitely get the level 4 but I'm very uneasy about the liquid cooler and pump life. The air fan in level 3 would most likely be more reliable, but it might not be as good to overclock with. I don't care for any major overclocking though and I will probably only let professionals do it for me rather than try on my own. I doubt I will ever want to go higher than 4.4 ghz.

Besides the liquid cooling is there any hidden differences between level 3 and 4?
For example, do they put a different motherboard in 4 than 3?

Can Level 3 still maintain almost as much performance as level 4?

Questions galore

Thanks to veteran members for putting up with my questions