Thank you for your support! My answers are yes and yes.

• Post on Busy and you will see it on Steemit. Post in Steemit and you will see it on Busy. We are working on the same standard to make it easy the integration of articles in multiple website/apps (Steemit/Busy/eSteem etc..).
• We are using the same blockchain/database so your keys and your rewards on both websites will be exactly the same.