Before answer this question may i know what is your intention to do.
1. When your current company has given you good hike of 20% then why you want to switch your job?
2. Many companies during notice period they hold employees salary, incentive and many benefits but in such scenario, your current company paid hike to you.
3. Your current company has given a hike and you want to do bargaining with offered company, this kind of thinking reflects your personality and may they terminate your offer letter.
5th June 2019 From India, Mumbai