Does the cat sx3 and Mi4 share many parts?

[Shaun_TLR]

Im looking at getting into touring cars. Most people at my local club run Xray T3's, which is attractive for obvious reasons. However...... I run a cat sx3 and someone suggested an Mi4 looks to share a fair few parts.

Can someone advise me as to whether this is true? It would def' play a part in which car I opt for!

Thanks muchly

Shaun