I have some cat5 cables in my attic in need to splice . they have been up there for 10 to 15years so no sure if cat5e or cat5.
I'm looking at a tool-less connector on amazon, but the color coding has a orange-green line I do not see in my cable
Cat 3/5/6 cabling can be connected in two "flavors" - T568A and T568B. The cable (without ends attached) is the same and they are functionally identical. The only question is the sequence - Blue/Orange/Green/Brown vs. Blue/Green/Orange/Brown. Most connectors & jacks include color-coding for both types, marked "A" and "B", so that you can mix & match parts from different brands and have everything work together. You can actually see that in the image if you look closely - A and B are printed on top of the color coding on both left (solid blue, pin 4) and right (brown/white, pin 7). If your device says "Cable should be T586A CAT 5" and you wire it up T586B CAT 5e, it will work just fine, because the electrons don't care about the insulation color.
I usually use T568B, but it really doesn't matter as long as you are consistent - i.e., both ends of each cable should (normally) be the same.
Each new cable type 3 -> 5 -> 5e -> 6 puts in new, more exacting requirements on the number of twists and other factors. So make sure any connectors, adapters, splices, etc. meet the requirements of the cable type you want to use. If you have Cat 6 everywhere except one segment is Cat 5e then you'll be fine with Cat 5e speeds but Cat 6 might not work, and you may have trouble figuring out why things aren't working right. So I would at a minimum use the same quality/specification for everything that is hidden - wall jacks, cable inside walls, splices in the attic, etc.
What's confusing you here is that the connector is doing some wire-shifting for you to make it easier to make your connection. I've never seen blue wires used for the first pair (normally the blue wires are pins 4 and 5 because you can use RJ-11 phone connectors with RJ-45 ethernet jacks and that setup is backwards compatible). You can see the pin numbers at the bottom of their color code. Normal Ethernet uses pins 1,2,3 and 6.
As mentioned in comments, B (where Orange is on pins 1 and 2) is the more common. You can pick A (Green on 1 and 2) if you so desire, but be consistent or you'll create a crossover cable (which is used to connect two computers together directly, instead of through a switch, and is almost certainly not what you want).