For those interested in this "inflation", there is a good chart here:
https://fork.lol/blocks/height
As it says, "Block height. BCH is currently ahead by 9272 blocks." with the block height of both being about 500k.
In fact, with the rate that BTC gains hashing power, and its comparatively less responsive difficulty adjustment algorithm, it is expected to overtake BCH's block height in the next couple of years.