What's the difference with these MK1 Escort air Vents?

Hi everyone, got myself a set of MK1 Escort air vents and their slightly different from what I had. I was just wondering if anyone knew why, maybe different years/models etc. First picture is of the vents I'm replacing and the second picture are the same style vents I'm replacing with. One set have vents which are straight and the other set have vents which are in a 'V' shape. Thanks