It certainly is.
Portisham, Dorset is 68 miles E of Huish, Devon.
It looks likely that Elizabeth's death was 1886 (age 85), registered Dorchester.
I do not see any baptisms for the children of Thomas & Elizabeth but on census returns they had (1841) Ann 14, Mary 10, George 7 (1851) George 17.
Have you found their birth/baptism records and were there any others?
In 1881 Elizabeth is with Mary & her husband Henry Bugler in Dorchester.
Colin