If your front struts are not seeping oil out where the shaft enters the shock body, you can reuse them. However, they will be in a compressed state because of the lower ride height. It's like pre-loading a set of coilovers. The strut will wear out faster and ride a little firmer. If they are original, you are probably due for them anyways.
Not sure if this is the right kit for your car
More Information for KYB KIT335013 (rockauto.com)
They are also not designed for the lower ride height. It looks like nobody makes a compatible lowering strut any more, so you're going with what you've got for now.
Some performance shocks will state if they are designed for lowered ride height:
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