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My VMware hosts are ESX 4.1 Patch 2 (build number 381591). Does that they already have ESX 4.1 Update 1 (build number 351621) installed on them? <br />
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Basically, I'm about to upgrade vCenter from 4.1 to 5.1 and I need to make sure I have ESX 4.1 Update 1 installed on my hosts to prevent a possible purple screen of death issue.
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My VMware hosts are ESX 4.1 Patch 2 (build number 381591). Does that they already have ESX 4.1 Update 1 (build number 351621) installed on them? 

Basically, I'm about to upgrade vCenter from 4.1 to 5.1 and I need to make sure I have ESX 4.1 Update 1 installed on my hosts to prevent a possible purple screen of death issue.

Does ESX 4.1 Patch 2 include the previous ESX 4.1 Update 1?

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.

VMware

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.