In Peterborough proposals being considered include taking the Fletton and Woodston wards from North West Cambridgeshire and adding them to the city.
But, splitting Stanground or taking out Newborough, Eye and Thorney has been ruled out
In Northamptonshire proposals being considered include extending Daventry into Leicestershire.
Kettering could also take Finedon while Irthlingborough move from Corby to Wellingborough.
If approved, the changes would be in effect by the general election in 2020.