We will not laugh at this question because there are metric and standard types of screws. Your new kit which is a Mugen and HPIis Metric threads and lengthandthe Losi 8 is all American which uses Standard threads and lengths.

There is a huge difference between the Standard "American" and the rest of the world who uses Metric styles. I run into the same problem with my Team Associated with are all Standard stye screws and the rest of my R/Cs are all metric. I have to have 2 sets of tools to work on each model. Standard and Metric tool sets.