Peukje of Becks?

Zeelt-20 (Peukje) en Zeelt-32 (Becks) lijken enorm op elkaar.
Toch zijn er ook wat verschillen, al veranderen littekens en vlekken door de jaren heen.
Hieronder kun je aan de hand van foto's en filmpjes de dieren met elkaar vergelijken.
Serieuze reacties op de onderzoeksvraag zijn welkom: "Zijn dit dezelfde of verschillende dieren?" Mail me s.v.p.

Tench-20 (Peukje) and Tench-32 (Becks) look very much alike.
There are some differences, though.
Take a look at the photographs (and films below) and see how they match or differ from eachother.
If you have a serious answer for me regarding the ID of these animals (this animal), please email me.

Darkly coloured patch on left cheek (enlarges each year)
Thickness at base of tailstock
Nicked dorsal fin (in 2013 only the top, after sept. 2014 also at the base)
'Nipple' (small protrusion) on tip of dorsal fin from 2014 onwards
Queerly formed mouth (on all occasions)
Left pectoral fin; either 'dolphinlike' (Z-32 in 2014-2015) OR with a big tear (Z-20 in 2013). This could differ each year, if tears in fins heal up. It also differs if the fin is kept close to the body.
right pectoral fin; either no tear at all OR with a big tear (Z-20 in 2013). This could differ each year if tears heal up.It also differs if fin is kept close to the body.
'Both individuals' (if that is the case) show quite easygoing behaviour towards the snorkelling researcher
If in doubt with this tench: check the strangely formed mouth! That's quite a unique feature.

First seen on 31st july 2013, eating a cigarette filter ('peuk') and then spitting it out.
According to the filmfootage, the Smoelenboek-page below was made:
(legenda: blacked out parts of a fin mean there is a tear/a part is missing)

uit het smoelenboek van Onder water in Leiden: zeelt 20

Is a male (first erroneously called Becky, now Becks). Recognizable protruding musclemass just above the belly-fins in the mating season makes it a male.