I'm the same! The more I look at them the more they seem different. Their noses don't look the same, and the lady on the left looks to be wearing a hat with more feathers in. It could just look that way because of the different angles/ picture fuzzyness I suppose. 2 similar aged sisters is very possible because there were 2 girls in the family with only 1 year between them, Ethel Eliza b.1865, and Agnes Maud b.1866
If these photos were taken 1880- 1885 that makes them 15-20ish. There was also a Lucy, b. 1859; Amy, b.1860; and Mary b.1854! Have been told that the other photo I put in a separate post on here is Amy. So that leaves Lucy, Mary, Ethel and Agnes!
Yes thanks for putting them on here again! I couldn't figure out how to do it. Makes it much easier!