None of Trafford, South Manchester, Stockport or South Tameside have been in Cheshire since 1974; none of Wigan, Bolton, Bury, Rochdale, Oldham, Salford, North Manchester or North Tameside have been in Lancashire since 1974; none of East Tameside or East Oldham have been in Yorkshire since 1974... no matter what people still think their address is, no matter what County people would like to live in, no matter if people think Greater Manchester isn’t a real thing.
All ten boroughs are in Greater Manchester, not one street of any of those ten boroughs are in Cheshire, Lancashire or Yorkshire.