摘自最近的一个IPO招股书：

Invitation in respect of 88,000,000 New Shares as
follows:-
(a) 3,000,000 Offer Shares at S$0.33 for each Offer
Share by way of public offer; and

(b) 85,000,000 Placement Shares by way of
placement, comprising:-
(i) 76,000,000 Placement Shares at S$0.33 for
each Placement Share by way of Placement
Shares Application Forms;
(ii) 200,000 Internet Placement Shares at
S$0.33 for each Internet Placement Share for
applications made through the IPO website
www.ePublicOffer.com; and
(iii) 8,800,000 Reserved Shares at S$0.33 for
each Reserved Share reserved for our Non-
Executive Directors, employees, suppliers,
business associates and those who have
contributed to the success of our Group,
payable in full on application.

请问(a)和(b)(i)有何区别？谢谢赐教！