Difference turnover gstr-4 vs books f.y.21-22

A gst registered composition scheme dealer sales turnover details mentioned below in in f.y.21-22
sales turnover as per books
1st quarter rs:18,93,320
2 nd quater rs 14,04,595
3rd quarter rs 15,18,516
4 th quater rs 14,79,179
sales turnover as gstr-4 returns
1.rs 420100
2, rs 420400
3rs,420400
4 590519
question,
Difference turnover tax pay procedure and tax pay with interest calculation procedure.