1. First the obvious one - both PHP and CCK belong to the comedy genre
2. Now the most talked about - Priyadarshan directed the original 'Hera Pheri' while he returns to direct 'Chup Chup Ke'
3. Both the films have their director doubling up as a writer too. Priyadarshan writes for CCK while Neeraj Vora writes for PHP.
4. Both have music by Himesh Reshammiya and lyrics by Sameer
5. Both boast of two HIT tracks each - 'Ae Meri Zohrajabeen', 'Mujhe Yaad Sataye Teri' [Phir Hera Pheri] and 'Shabbe Firaq', 'Dil Vich Lagaya Ve' [Chup Chup Ke]
6. Both star Paresh Rawal and Suneil Shetty in important roles
7. Both star Rajpal Yadav and Shakti Kapoor as a comic relief
8. Shahid Kapoor worked with Firoz Nadiadwala [producer of PHP] in 'Deewane Huye Paagal' while Akshay Kumar worked with Priyadarshan in 'Garam Masala'
9. Priyadarshan got his first comic success in Bollywood with Akshay Kumar in 'Hera Pheri'. In contrast Neeraj Vora got a flop in his debut vehicle 'Khiladi 420', an action film with, guess what, Akshay Kumar!
10. In the past, Neeraj Vora has written for both Priyadarshan [Hera Pheri, Yeh Tera Ghar Ye Mera Ghar, Hulchul, Kyon Ki, Garam Masala] and Firoz Nadiadwala [Deewane Huye Paagal]
11. In the future too Neeraj Vora is writing for both Priyadarshan [Bhagam Bhag] and Firoz Nadiadwala [Fool & Final]
12. While Priyadarshan's 'Bhagam Bhag' would star Akshay Kumar [hero of 'Phir Hera Pheri'], Neeraj Vora written 'Fool & Final' would star Shahid Kapoor [hero of 'Chup Chup Ke']

And now some common factors between 'Bhagam Bhag' and 'Fool & Final':

1. Both would again star Suneil Shetty as the other lead.
2. Both would have a macho hero each. While 'Bhagam Bhag' boasts of Sanjay Dutt, 'Fool and Final' would have Sunny Deol leading the star pack.
3. Both would have a Bengali heroine in lead - Tanushree Dutta and Bipasha Basu respectively.
4. Both would also star Jackie Shroff in a pivotal role.
5. Both would have the now famous comic 'jodi' of Paresh Rawal and Rajpal Yadav

Coming back to PHP and CCK, both look good to be successful at the box office with good pre-release buzz and hype!