Patch SUPEE-7405 v1.1 release, is it same as we had 7405 earlier?

Question

It's not been long since I had applied SUPEE-7405 and magento says there is another one available. I am not sure if this is the same as before.

Today, we are distributing updates that improve our most recent security release. SUPEE-7405 v1.1, Enterprise Edition 1.14.2.4, and Community Edition 1.9.2.4 add support for PHP 5.3 and address issues with upload file permissions, merging carts, and SOAP APIs experienced with the original release. They DO NOT address any new security issues.

What interest me is what does this mean?

They DO NOT address any new security issues.

I am sure I am not upgrading at this moment, but what's the main reason of this patch?

What files should I look in to? I have got lot of extension.

Answer 1

TL;DR   No, it's not the same. It patches v1.0 to not break stuff

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If you had no issues with applying SUPEE-7405 causing any of the following issues, you are probably OK.

1. You go to the Sales Order grid, select a Sales Order to view and the page comes up blank.
2. Images uploaded for wysiwyg, categories, etc do not show until the file permissions are changed to 644
3. Attempting to use the SOAP API causes the server to throw a 500 error or other nonsense.

Full description of various issues raised by this patch => Security Patch SUPEE-7405 - Possible Problems?

NOTE: SUPEE-7405 v1.1 is a patch of a patch and therefore v1.0 is a prerequisite before installing v1.1. From the release:

You must install the SUPEE-7405 v 1.0 patch before installing the SUPEE-7405 v 1.1 patch bundle if you are running a version of Magento Enterprise Edition prior to 1.14.2.3 or Magento Community Edition prior to 1.9.2.3

NOTE: If you modified the files patched by v1.0 to restore function to your website, you will have to undo your core modifications before this patch will install. It expects all files modified by v1.0 to be intact before it will apply.