As per your query there is a lot difference between simple B.Com and B.Com (Hons.). below are the details:

B.Com Hons.
Course is under graduate degree course. It includes subjects like cost accounting, organizational behavior. The course is designed to build up the ability to understand and judge thing related to business administration. After undergraduate you can apply for master degree with specialization in accounts and economics.

Eligibility : 10 + 2 or equivalent, English and Maths as compulsory subjects.
Course duration: 3 years with specialization

Scope:

You can join in following sector:

KPO (Knowledge Process Outsourcing) sector
Banking
Finance
Account Assistant
Auditing Department
You can also pursue course CA along with your B. Com
Pursuing post graduation like MBA or M.Com

B.Com Pass course

B.Com Pass course is also an undergraduate course but unlike B.Com Hons course there is no specialization in one subject. In B. Com pass course you have an overview of all subjects of Hons. Course. More or less both courses are similar.

Eligibility: Eligibility criteria is same as B.Com Hons course

10 + 2 or equivalent, English and Maths as compulsory subjects.

Course duration: 3 years without specialization

Subjects:

In first year you have to read about the subjects like business economics, basic ideas of information technology, financial accounting, business organization and management

In second year you have more knowledge about Auditing, Business Laws, Corporate Accounting Cost and Management Accounting

In third year you have lots of option to choose the subject of your interest like you may choose

1. (a).Principles of Marketing

(b). Rural Marketing.

2. (a). Advanced Corporate Accounting

(b). Management Accounting

3. (a).Central Banking & Development Banking

(b). Computer Applications in Banking

4. (a). Financial Management

(b). Micro Credit & Foreign Trade Finance

5. (a). Income Tax - I

(b). Income Tax - II

Other differences is:

B Com (H)
Taught in depth of the subjects
Cut Off is Relatively high
Industry's Demand is More

B com (P)
Given overview of the subject(s)
Cut Off is Comparatively low
Industry's Demand is less comparatively