Peter I think Pamela's pink, Tony's amber and your small blue are all from the same stable. The pattern is the same, and the feet whilst being different styles have the same number of sides. I think your larger blue vase is from a different maker - perhaps copying a popular pattern and changing it just enough to avoid accusations of plagiarism - i.e. alter the foot a bit, change the wing sizes and position, scallop the top a little. It still looks close enough but it's not the same.
Leni I can't tell from your pic if there's enough similarities or differences - can you post some extra shots, side, top view, etc.?