As someone who has never used GitLab, it is perhaps interesting to note that I would have literally no idea of the chronology of those images you've linked; if I had to guess, I would say the grey one (1) looks older than the purple one (4), but the other two look almost entirely unrelated.
The images 1…4 are in chronological order, the URLs contain the version if interested. However, should you look at them in any order or sequence, it goes to show how different the UI has looked throughout the life of the product.
