The second one is a 28K.
The filigree decals were designed for round bobbin machines, so if they are on a 28K it is because it was re-japanned at some stage. You can see the gap in the decals at the left for the non-existent round bobbin slide-plate. I learnt to sew on my mum's machine (which I still have, and which features in two of my videos) and it is a 28K made in 1897, but with filigree decals. The filigree decals did not come in until later. We have a lot of old 28Ks here that were reconditioned many years ago, and they weren't fussy what decals they put on them.