Conti tyre sizing – true to listed width? (Race Kings specifically)

Conti tyres – are they true to listed width, or size up narrower/wider? I’m looking at Race Kings specifically, in 2.0″ (50-622) or 2.2″ (55-622).

Can anyone offer experience of the actual real-life width of these?

Currently using Clement XPlor MSO 700×50 (50-622) which are wider than listed at 54.2mm on a 25mm internal width XR391 – my SKS Edge AL56s only just cover them. I’m surprised at the width! I’d be disappointed if the 2.0 RK comes up small in real life as I’m enjoying the comfort of my Clements, but equally the 2.2 RK would cause mudguard clearance issues* if it’s anything bigger than listed.

I measured a few tyres to compare (all on 25mm rims) – not surprising (but still annoying) about variance from listed size:
– Schwalbe G-One Ultrabite 700×50 (50-622) – 48.6mm
– Ardent 29×2.25” (56-622) – 56.5mm
– Minion DHF 29×2.3” (58-622) – 56.5mm
– Vittoria Saguaro 29×2.2” (55-622) – 57.6mm

* frame has clearance for wider guards front and rear but I’ve no idea which wider full-length guards would play well, and I like my SKSs. Rear would need to be more rounded profile due to tightness at chainstays.