Sling lengths for moving mazak QT 30, 28, 25, 20 etc... are they equal?

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We are moving shops and I have 6 machines to move. We're loading them with a fork lift on this end and unloading with an overhead crane on the other. My question is are all 3 slings equal in length? Or is one about a foot shorter. It doesn't say in the manual. All it says is use 20mm cable and a crane with at least a 5 ton capacity. or are you to assume by not mentioning it they're equal length? Any help would be awesome.