I found the lighter skinned spider on Tuesday and the black on today.. I have never seen one like the lighter spider before and I think I have seen many different spiders mainly from growing up and the black on caught my attention for how it was positioned different to what your usual spider is in waiting for prey
The first 2 shots of the black spider are Nuctenea umbratica (Walnut orb weaver), it's a male. These spiders usually hide away during the day, spinning their webs at night. The females typically have much larger abdomens.
The 2nd 2 shots of the light spider are possibly a Clubiona species (sac spider). I couldn't say which one (need close up inspection), but google some pics of Clubiona phragmitis (for example) and you'll see images of similar spiders.