Let me try to Explain.
Between Kit for Carb and EFI only few Things are different.
Same Cylinder like Carb
Same KIT like Carb Lendi Renzo Tn1.
Emulator for EFI Injectors.
Switch is different.
KIT TN1 Same
Advancer is SPark Advancer but 99% dont install it and just run by advancing timing from Distributor. You can also in EFI Car and save some money if your efi car comes with distributor but the engine will knock on Petrol.
Switch is CARB one.
Now if he is saying he will install Emulator and EFI Switch in your carb car hmm dont know what hes upto
Buss yahe difference hai bhai EFI aur Carb kit main baki you can use carb kit in EFI by just installing EFI Switch and Emulator and advancer.