Is there a way to engine swap legally in India?

Recently I was surfing done Youtube erstwhile I came crossed a video wherever they were swapping a W204 C250 with a C63 V8. This made maine wonderment if it was ineligible to swap engines successful India. I looked up for the reply to my question, but I could not find a due reply to it. Thus I opened up TeamBHP and tried uncovering a thread related to it but each I recovered was an aged thread from 2008 which again, did not person a due answer. All I recovered was:

• You tin swap an motor if its from the aforesaid shaper oregon it has the aforesaid magnitude of power.
  
• You tin swap engines if you tin get the close permissions from your states RTO, which seemed to beryllium the close reply but upon looking deeper, galore disagreed with this and said that 1 cant swap the motor without transferring the chassis number.
  
• A petrol to petrol swap is allowed but not a petrol to diesel oregon a diesel to petrol.

I don't person immoderate different spot to corroborate upwind this accusation is existent oregon not. If determination are immoderate members who enactment astatine the RTO oregon are alert astir this taxable delight springiness maine an penetration if its imaginable oregon not to swap engines legally.

Lets accidental I privation to swap a W211 E280 petrol with a 6.2L M156 V8 from a W211 E63, is it imaginable to bash this legally?

Many said that the constabulary oregon authorities don't look that heavy into your car, but if I privation my car insured, I indispensable cognize if its ineligible to bash so. Driving an amerciable car is not worthy the hazard successful my opinion.