Repost: createRuleAllowingCidrBlock vs createRuleAllowingSecurityGrou pId

[Bk Lau]

I'm confused as to the differences between the 2 ways to create a security
rule below:
Seems that both methods below has the same signatures:

 /**
    * Create a Security Group Rule.
    *
    * @return a new Security Group Rule
    */
   SecurityGroupRule
I'm confused as to the differences between the 2 ways to create a security
rule below:
Seems that both methods below has the same signatures:

 /**
    * Create a Security Group Rule.
    *
    * @return a new Security Group Rule
    */
   SecurityGroupRule createRuleAllowingCidrBlock(String parentGroup,
Ingress ingress, String sourceCidr);

versus
   /**
    * Create a Security Group Rule.
    *
    * @return a new Security Group Rule
    */
   SecurityGroupRule createRuleAllowingSecurityGrou
pId(String parentGroup, Ingress ingress,
            String sourceCidr);
(String parentGroup, Ingress ingress, String sourceCidr);

versus
   /**
    * Create a Security Group Rule.
    *
    * @return a new Security Group Rule
    */
   SecurityGroupRule createRuleAllowingSecurityGrou
pId(String parentGroup, Ingress ingress,
            String sourceCidr);