Bean Geese??

Yesterday at about 10.30 am I found what I think are two taiga bean geese on Maes Lynn. I could not see any rings on them. Strangely, they were following 2 greylag geese for ages, mirroring what they did and even taking off and landing with them. One of the bean geese was making a high-pitched 'squeaking' sound at times. I wonder if they are escapes from somewhere.