The chassis is very similar. But there are some differences in connectors, see:
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The 75g may fit inside the 74G case but it won't be a simple drop-in due to slightly different PCB shape and port, screw positions. Either google search keywords 'ACER part nos' or E5-474G motherboard for vendors. Aliexpress usually has the best prices on motherboards but delivery times may take up to 4 weeks if it doesn't have a warehouse in your country.
Appreciate the answer, I've found a few motherboards for sale, but they don't seem to have the GPU or GPU memory attached, which wouldn't be an issue but I can't seem to find either for sale. (940m Nvidia integrated gpu btw)
Which of the above motherboards listed for the 74G do you want? There are only 3. The CPUs usually are soldered BGA sockets and can't be changed so I'm not sure what boards you've found without the CPUs. The nvidia chip is not integrated with the CPU, it is also soldered to the mainboard.