I have always had Space Black, right from the Series 0 when I got with the Space Black link bracelet. Have regularly updated the watch since but always kept the bracelet which is still my favourite strap (and cost a fortune). Would there be a colour match issue with the Graphite watch, in which case meaning I would need to go for the SB titanium?Significantly lighter. I don’t have a side-by-side comparison for you, but I have had space black before and can tell you this is closer to silver than space black on the colour spectrum.