Hello,
The guides for the M130 (280) engine are the samein any version, early, late, etc. even though there are two distinct cylinder heads for a 280 SE, SL. In fact even the valve guides for the carbureted 280 engine are the same. In short, all M 130 engines use the same intake valve guides and the same exhaust valve guides. Different oversizes are available in the event that the holes in the head are two big for a standard guides. Oversize guides are not usually needed unless a valve guide has come loose in the head causing the hole to enlarge.
M130 280 pistons will not work in your 230SL engine. The diameters are way different among other things (possibly different wrist pin diameters) .
In any case using diffenent styles of pistons in the same engine is asking for problems. The different weight of the pistons could cause some major engine imbalance. Always check the cylinder wear and ring groove wear before using used pistons. Ring grooves are checked by inserting a feeler gauge in the space between the piston ring and its groove. Mercedes allows about .004" If the ring groove becomes too wide, the ring can twist and break.
Using the differnet connecting rods is not possible . Besides a huge weight difference, the oil supply holes in the rods are different. Also the wrist pin size and the rod bearings are also different.