Colourful periwinkles

Colourful periwinkles

Observation - Colourful periwinkles. Description: I think this is a mix of Common periwinkles (red and grey ones at the top) but am I right that the smaller yellow ones are Rough periwinkles - based on their colour and the wider, deeper grooves in the shell? Am posting my suggested ID for the yellow one

I think this is a mix of Common periwinkles (red and grey ones at the top) but am I right that the smaller yellow ones are Rough periwinkles - based on their colour and the wider, deeper grooves in the shell? Am posting my suggested ID for the yellow ones.