Yes, it is the same version.  I actually removed the ruby packages that 
CentOS loaded as part of the developer toolset before installing the 
latest with RVM.

And I have subsequently discovered that NONE of the gems I installed can 
be found so I am obviously missing something fundamental.

$ gem list

*** LOCAL GEMS ***

rake (0.9.2 ruby)
ruby-oci8 (2.0.6)
ruby-ole (1.2.11.2)
ruby-prof (0.10.8)
rubygems-update (1.8.10)
sources (0.0.1)
spreadsheet (0.6.5.9)



$ ruby -rubygems
require 'oci8'
puts 'Hello World!'
/usr/local/rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in 
`require': no such file to load -- oci8 (LoadError)
        from 
/usr/local/rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in 
`require'
        from -:1:in `<main>'
$

$ ruby -rubygems
require 'ole'
puts 'Hello World!'
/usr/local/rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in 
`require': no such file to load -- ole (LoadError)
        from 
/usr/local/rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in 
`require'
        from -:1:in `<main>'
$

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