Need some advice.

I got a verbal offer from an organisation for position 1. May take weeks before signing the employment contract.

The same organisation (different departments) calls me down for interview for position 2. Should I go for the interview?

On one hand, I don't feel secure as I haven't sign contract for position 1. On the other hand, I already agreed verbally to take up position 1 and the organisation might know I went for interview for position 2.