Yes, read instructions but I think you have to be in fastbootd first. Then double check the model number of your device and which ROM it comes with - it may be that the Indian ROM and global are the same or can both be installed on the same model, but I can't say for certain, I have global model with global ROM
I'm not 100% sure what you're referring to as it's been a while since I used the stock ROM flashing package but maybe the below will help? It's my understanding Global will work for Indian, Europe and North American models (mine was Europe, I used global) and Chinese / HK and T-Mobile have their own images. Sorry I can't provide these.
Both OnePlus 7 and OnePlus 7 Pro have several variants. The differences are usually with the supported bands.
HD1905 North America